Device for erasing a record carrier recorded by magnetic fields in visually readable form

Abstract

The record carrier allows visually readable recordings of measured values. A measuring device associated with said record carrier is driven by a drive device. The erasing device comprises at least one erasing magnet positioned directly on top of the record carrier and movable transverse to its transport direction so that the magnetic axis is parallel to the plane of the record carrier. The movement of the erasing magnet is effective essentially in the direction of the magnetic axis. A permanent magnet is used as the erasing magnet. A carrier for the magnet is in driving connection with the driving device of the measuring device.

What is claimed is: 
     
       1. In combination with a record carrier modifiable by magnetic fields wherein a magnetic recording means allows visually readable recordings of measured values and wherein drive means are used to drive a measuring device associated with said record carrier, an erasing device comprising at least one erasing magnet positioned directly on top of the record carrier and movable transverse to the transport direction of said record carrier so that the magnetic axis of said magnet is parallel to the plane of the record carrier, the movement of the erasing magnet being effective essentially in the direction of the magnetic axis wherein a permanent magnet is used as the erasing magnet; and a carrier for the erasing magnet, said carrier being in driving connection with the driving means of the measuring device. 
     
     
       2. An erasing device according to claim 1, including means for providing an oscillatory motion to said magnet carrier. 
     
     
       3. An erasing device according to claim 1, wherein the carrier of the erasing magnet is itself rotatably mounted. 
     
     
       4. An erasing device according to claims 1 or 3, wherein as an erasing magnet a rotatably mounted, disc-shaped magnetic body of permanent magnet material is used at the circumference of which at least one pair of poles is provided, the magnetic body being in driving connection with the record carrier.